Burggraf

Elective sovereigns of Germany, all the German kings, and dukes, and margrafs, and burggrafs were numbered among their retainers.

Source: wiktionary

The castle, built on a precipitous rock overlooking the town, and formerly the residence of the markgrafs, burggrafs, and bishops of M., was rebuilt in 1471; […]

Source: wiktionary

From these men arose the class of crown vassals, grafs, landgrafs, markgrafs, burggrafs, pfalzgrafs, princely highnesses, dukes, serenities, transparencies, gracious lords, &c., &c.—as wearisome to repeat as the musical instruments of King Nebuchadnezzar—holding feofs, and exercising jurisdiction in their several domains.

Source: wiktionary

After the victory of Muhldorf, when the Kaiser Ludwig sat at a meal with his burggrafs and great captains, he determined on a piece of luxury—“one egg to every man, and two to the excellently valiant Schwepperman.”

Source: wiktionary